feat: ts报错修改

src/views/choose-homework/music-list/index.tsx

@@ -708,7 +708,7 @@ export default defineComponent({
                             round
                             block
                             onClick={() => {
-                              this.$refs.dropItem.toggle();
+                              (this.$refs.dropItem as any)?.toggle();
                               // 如果手动选的全部声部，查询的时候不需要默认选中第一个声部
                               this.isAllSubject = appState.subjectId === 0 ? true : false;
                               this.onSearch();